Question

how can we use modals

Answer 1

→A modal is a type of auxiliary (helping) verb that is used to express: ability, possibility, permission or obligation.
→We use modal verbs to show if we believe something is certain, probable or possible (or not). We also use modals to do things like talking about ability, asking permission making requests and offers, and so on.

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Answer 2

It helps to make meaningful sentence...